ABSTRACT
The textile industry uses a large volume of water, which makes it necessary to find more sustainable options for its use, such as reuse in new dyeing. The use of a solid industrial waste as an adsorbent may be an alternative to treat the textile effluent. The objective of this study was to test the viability of the reuse of dispersed dye solution, treated with residue of the clarification of vegetable oil as an alternative adsorbent, in polyester/cotton (PES/CO 50/50) knitted fabrics dyeing. Two types of pre-treatment were used in the adsorbent, natural (RC) dried at 70°C for 24h and calcined (RCc) at 600°C for 2h30min. Dyeing was performed with the solution treated at 100%, 75% and 50% (v/v) concentrations and in light colors, the pattern was dyed with water from the textile industry. UV-Vis spectrophotometry was used to evaluate the efficiency of the treatment and the evaluation of the red tissues by dyeing parameters: exhaustion (%) by UV-Vis spectrophotometry; K/S, relative strength (SR%) and DE by remission spectrophotometry, as well as color fastness to washing and friction . The treatment efficiency was 91,26% for RC residue, and 95,38% for RCc. Values ranged from 80% to 92% for PES and 70% to 85% for CO. The DE ranged from 0,22 to 1,2, with most values falling into the range accepted by industry (DE≤1,0). There was no great variation for K/S and SR (%) values, with the greatest variation of 0,09 units for K/S and 7,2% for SR (%). The color fastness showed grades between 4/5 and 5 on the gray scales, indicating that there is no migration of the dye. The proposal of treatment and reuse of the solution in new dyeing showed as a viable alternative when compared
Keywords
Polyester; Cotton; Fibers; Adsorption; Dye
